Around 16,000 farmers are expected to arrive at the NEC today, when the Royal Association of British Dairy Farmers stages its biggest dairy show yet.

Some of the latest industry innovations will be at the show, including robotic milking machines, milk pregnancy test kits, computerised neck collars to detect cows' fertility and 'text messaging' feeding machines.

Hundreds of dairy farmers from the East Midlands left their fields today to join a big protest in London. They say further cuts to the amount they receive per litre of milk will drive them out of business.

They're calling on the government to bring in legislation to help them counter what they say is an attack on their livelihoods.